Gwydion Dylan PPC is a compiler for the programming language Dylan. The d2c compiler was developed at Carnegie Mellon University and open sourced 1998. A group of volunteers is improving the compiler and porting it to other platforms since then.
Dylan is a modern object-oriented programming language featuring multiple dispatch, multiple inheritance, closures and a pattern matching, hygienic macro system. Gwydion Dylan PPC is a port of d2c to the CodeWarrior integrated environment. It compiles to C which is in turn automatically compiled to object code by CodeWarrior.